The Canadian Department of National Defence has done a variety of things in the vehicle area. I think they did try some life extension, and they probably still have in service M113s. As a vehicle gets old, it becomes very difficult to keep it running. It has a limited weight capacity. The difficulty with M113s was their ability to carry the necessary armour that was desired to protect the soldiers.
On February 12th, 2008. See this statement in context.